How can I keep the volume in my hair throughout my school day?

Well, with my hair when I want volume I shampoo with a voluming shampoo and conditioner. I then use a voluming mousse and blow dry upside down. I then hairspray. When I want it straight, I straighten it all but my roots. One thing that helps is my shampoo, conditioner, mousse, and hairspray are all the same brand.